President Obama has nominated retired Lt. Gen. Malcolm O'Neill, a former top Pentagon missile defense official, to serve as the Army's assistant secretary for acquisition, logistics and technology and its top acquisition official, a move that would end the service's nearly two-year run with an acting acquisition chief. O'Neill served as head of the Ballistic Missile Defense Organization -- the precursor to the Missile Defense Agency -- in the 1990s. Today, according to the Obama administration's forthcoming announcement, he is...